Seem to be having some problems :/

Ok so as you do on rFactor you're looking for mods etc to have some fun! Well i've downloaded two mods one being v8Factor and the other Endurance Series. Now for some reason these just won't work for me? When I select them to play them using the rFactor Dedicated (i know this is for servers as-well but you can select the mod you want to play right?) Anyways with these two specific mods when I press to go onto the next step "Vehicles" the application closes itself and then when i go to load rFactor the same happens with rFactor.

I honestly have no idea what's causing it, i mean i managed to install some other mods fine, it's just these two I'm having a problem with!